http://airfoiltools.com/ It doesn't really give you the search function (IIRC), but you can navigate through "similar" airfoils. E.g if you start with a low Cm high Cl airfoil it will show you a list of similar ones then choose the one you like best, rinse and repeat.A lot of the problem with airfoil selection is that there are already thousands of them. Yes, there's probably a near perfect one for your pet project, but actually finding it is VERY tedious. If anyone could point to (or create!) a database where you can search based on min/max Cl, L/D, Cm etc, a lot of us would be eternally grateful.